Retorting

Chemical Precipitation on Mercury

The Chemical Precipitation on Mercury of the Gilmour – Young Process is a method that has been employed at the Santa Francisca Mine, Nicaragua. The ore contains a very large percentage of clay, the slimes amounting to 70 per cent, of the ore. The ore is crushed by a No. 5 Krupp ball mill through a 30-mesh sieve, and is charged into Boss pans, 4 feet in diameter, in 2-ton lots, with 100 gallons of water, so as to form a thick pulp. From two to six bottles of mercury are added, and circulation continued until the globules can be seen dispersed through the pulp, and then the required amount of cyanide. After running for two hours, 10 lbs. weight of mixed copper and zinc amalgam are added, and the pan run for four hours more. The gold is dissolved in the cyanide and precipitated by the zinc and copper, only 10 grains of gold per ton remaining in solution.

The pulp and solution are then discharged into a settler and diluted, and the mercury recovered in the ordinary way. The amalgam is used over again, and eventually a bullion 800 fine is obtained by retorting.

The power required for treating 50 tons per ….Read more

Gold Smelting & Refining Process

Gold can be concentrated and recovered by applying different gold refining process methods and the final product has variable quality. In this way, it is necessary to have a better marketable product so that the incomes can be improved. Then, we have two smelt and cast the gold into bars called bullion or Dore. The name bullion is restricted to the precious metals, refined or unrefined, in bars or ingots that contain small contaminants.

For many years, the term bullion made reference to coins and the name base-bullion is for pig-lead or copper bottoms obtained in smelting operations of lead and copper concentrates. The last product is characterized for containing small amounts of gold and silver. The treatment of these products depends on the metallurgical extractive process of lead and copper.

Gold Smelting Equipment

It has been shown that concentrates obtained by gravity devices and cathodes can be smelted directly most the time. Silver-gold concentrates can be smelted too. Under this consideration, a concentrate must contain at least 20 oz/t of gold. gold-refining-process-chartObviously, if the higher grades are better and 50 oz/t is a good ….Read more

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